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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
0.4/X = 2 // - 2
0.4/X-2 = 0
0.4*X^-1 = 2 // : 0.4
X^-1 = 5
-1 < 0
1/(X^1) = 5 // * X^1
1 = 5*X^1 // : 5
1/5 = X^1
X = 1/5
X = 1/5
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